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The sound unit (AS) to the radio "Rigonda-stereo" has been produced since 1963 by the Riga Radio Plant named after A. Popov. One speaker has two 4GD-28 low-frequency loudspeakers and two 1GD-19 high-frequency loudspeakers. High-frequency speakers are installed on the side walls of the speakers. The frequency range of reproducible speakers is 60 ... 12000 Hz. Resistance 8 ohm. Speaker dimensions - 430x320x805 mm. Weight 8 kg. Photos of the speakers at the bottom of the site http://retrotexnika.ru/